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Variant Histology, Igd and CD30 Expression in Low Risk Pediatric Nodular Lymphocyte Predominant Hodgkin Lymphoma: a Report from the Children’S Oncology Group

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Variant Histology, Igd and CD30 Expression in Low Risk Pediatric Nodular Lymphocyte Predominant Hodgkin Lymphoma: a Report from the Children’S Oncology Group Variant Histology, IgD and CD30 expression in Low Risk Pediatric Nodular Lymphocyte Predominant Hodgkin lymphoma: A report from the Children’s Oncology Group Ramona Vesna Untanu1, Jason Back2, Burton Appel3, Qinglin Pei4, Lu Chen5, Allen Buxton6, David C. Hodgson7, Peter F. Ehrlich8, Louis S. Constine9, Cindy L. Schwartz10, and Robert E. Hutchison1 1State University of New York Upstate Medical University, Syracuse, NY, USA, 2Chatham- Kent Health Alliance, Chatham, ON, 3Hackensack University Medical Center, Hackensack, NJ, 4Children's Oncology Group, University of Florida, Gainesville, FL, 5City of Hope, Duarte, CA, 6Children's Oncology Group, Monrovia, CA, 7Princess Margaret Cancer Centre, Toronto, ON, 8University of Michigan, Ann Arbor, MI, 9University of Rochester, Rochester, NY, 10University of Texas MD Anderson Cancer Center, Houston, TX Correspondence: Robert E. Hutchison, MD, Department of Pathology, Division of Clinical Pathology, State University of New York Upstate Medical University, 750 E. Adams Street, Syracuse, NY, USA, 13210. Phone: (315) 464-6771. Fax: (315) 464-9569. E-mail: [email protected] Word count, abstract: 249. Word count, main text: 2,817. Figures: 6. Tables: 0 Running title: Pediatric NLPHL histology and immunophenotype Keywords: Hodgkin, lymphoma, children, histology, pathology. Abbreviations: NLPHL Nodular lymphocyte predominant Hodgkin lymphoma EFS event free survival CHL classical Hodgkin lymphoma LRCHL lymphocyte-rich classical Hodgkin lymphoma IHC immunohistochemical LP lymphocyte predominant HL Hodgkin lymphoma This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/pbc.26753. This article is protected by copyright. All rights reserved. TCHRLBCL T-cell/histiocyte-rich large B-cell lymphoma EBV Epstein Barr virus H&E Hematoxylin and eosin AV-PC doxorubicin/vincristine/prednisone/cyclophosphamide IFRT involved field radiation therapy EBER EBV encoded ribonucleotide HRS Hodgkin Reed Sternberg Research reported in this publication was supported by the Children’s Oncology Group, the National Cancer Institute of the National Institutes of Health under award numbers U10CA098543 and U10CA098413, NCTN Operations Center Grant U10CA180886, and NCTN Statistics & Data Center Grant U10CA180899. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This article is protected by copyright. All rights reserved. 2 Abstract: Background: Histologic prognostic factors have been described for nodular lymphocyte predominant Hodgkin lymphoma (NLPHL). This study examines histologic and immunophenotypic variants in a clinical trial for pediatric NLPHL. Procedure: One hundred sixty-eight cases of localized NLPHL were examined for histologic variants, CD30 and IgD expression, and outcome. Histologic types were scored categorically as 0=0, 1 <25%, and 2 >25% of the sample. Results: Fifty-eight (35.1 %) cases showed only typical nodular with or without serpiginous histology (types A and B). The remainder showed mixtures of histologies. The numbers of patients with score 2 are: 85 (50.6%) type A, 21 (12.5%) type B, 46 (27.4%) with extranodular large B-cells (type C), 3 with T-cell rich nodular pattern (type D), 55 (32.7%) with diffuse T-cell rich (type E) pattern, and 2 (1.2%) with diffuse B-cell pattern (type F). Higher level of type C (p=0.048) and type D (p=0.033) resulted in lower event free survival (EFS). Cytoplasmic IgD was found in 65 of 130 tested (50%), did not significantly associate with EFS but positively correlated with types C and E histology (p<0.0001) and negatively correlated with types A (p=0.0003) and B (p=0.006). Seventeen (10%) expressed CD30, with no adverse effect. Conclusions: Variant histology is common in pediatric NLPHL, especially types C and E, which are associated with IgD expression. Type C variant histology and possibly type D are associated with decreased EFS, but neither IgD nor CD30 are adverse features. Variant histology may warrant increased surveillance, but did not affect overall survival. Introduction Nodular lymphocyte predominant Hodgkin lymphoma (NLPHL) represents 5-10% of Hodgkin lymphoma with a male predominance and typical presentation of low stage disease without B symptoms. NLPHL is usually slow-growing and responsive to therapy, but may be more aggressive.1 Children’s Oncology Group trial AHOD03P1 was designed to test the efficacy of stage- directed reduced-therapy treatment of low-risk NLPHL in young people, with stage IA or IIA disease.1 At the time of protocol design, there had been recent reports of a relatively new subtype of classical Hodgkin lymphoma (CHL) mimicking NLPHL, lymphocyte-rich classical Hodgkin lymphoma (LRCHL).2 These were noted in one large series to constitute about 34% of cases previously diagnosed as NLPHL.3 The protocol was designed with a “watch and wait” component for totally resected stage IA disease present in a single node. Out of concern that this would not be appropriate for CHL, This article is protected by copyright. All rights reserved. 3 all cases were required to have immunohistochemical (IHC) staining performed, and all were subjected to rapid pathology review. The morphology and immunohistochemistry of NLPHL show nodules of small B-cells with admixed larger neoplastic lymphocyte predominant (LP) cells (Fig. 1A).4,5 (LP cells are also sometimes referred to as L&H cells, from an earlier name of lymphocytic and histiocytic HL). LP cells are mature B-cells that label positively for CD20, CD45, B-cell transcription factors OCT2 and BOB1, and immunoglobulin J-chain. They are usually negative for both CD30 and CD15 (in contrast to classical Hodgkin Reed-Sternberg cells which are typically positive for both). T-cells often rosette around the large cells (Fig. 1B) and CD57/CD4 positive T-cells may be increased in the nodules, while other T-cells predominate in the internodular areas. Morphologic patterns have been described to include classic morphology (nodular or serpiginous, type A or B), as well as several categories of variant histology, including those with prominent extranodular LP cells (pattern C), T-cell rich nodules (pattern D), diffuse T- cell rich (T-cell rich large B-cell lymphoma [TCRBCL]-like, pattern E) and diffuse B-cell rich patterns (moth-eaten, pattern F).6 Variant histology has been incorporated into novel grading schemes for NLPHL as it has been tentatively associated with adverse features.7-10 Positivity for CD30 has been noted in up to 28% of NLPHL, usually focal or heterogeneous and more frequent in the presence of Epstein Barr Virus (EBV).11-14 CD30 may provide a target for anti-CD30 therapeutic antibodies in the rare CD30-positive cases which relapse.15 IgD expression has been described to be frequent in young male patients and to be associated with the presence of large B-cells in the extranodular regions.7, 16 In this study we examine the histologic patterns, CD30, and IgD expression of NLPHL, and compare them relative to patient outcomes in the context of a single pediatric clinical trial. Patients and methods Patient group Patients were those enrolled in a non-randomized clinical trial (study AHOD03P1) for low risk NLPHL conducted at Children’s Oncology Group institutions from January 2006 through November 2010 (ClinicalTrials.gov Identifier NCT00107198). Written informed consent was obtained according to institutional guidelines and in compliance with Declaration of Helsinki guidelines. Eligible patients were less than 22 years of age with stage IA/IIA NLPHL. Patients with B symptoms or bulky disease were excluded from the study. Histology Stained and unstained slides from fixed, paraffin embedded lymph node biopsies were histologically reviewed and assessed according to histologic pattern, and according to CD20, This article is protected by copyright. All rights reserved. 4 CD30, and IgD immunophenotype of the neoplastic LP cells. CD20 and CD30 were performed prospectively at treating institutions and were required for entry on the protocol. Protocol guidelines also recommended a minimum antibody panel of CD45, CD3 (or CD45Ro), CD20, CD15, CD30, and kappa and lambda immunoglobulins, with optional recommendation of CD57, BOB.1, EMA, CD79a, BCL6, CD68, Oct2, ALK-1, and J-chain. CD21 and/or CD23 were scored in some cases, although not stressed for diagnosis at the time of protocol design. Most cases had been vetted by expert hematopathologists prior to enrollment in the study. All submitted slides were reviewed prospectively and diagnoses confirmed on enrollment in a rapid review. Submitted CD30 stains were examined, staining of all cases described as positive at the treating institution was repeated, and additionally was repeated for all other cases with unstained slides. Final scoring of CD30 was based on our review of one or more slides. For most cases, CD20 staining was also repeated. IgD was performed on all cases that had available unstained slides. Repeat IHC stains were performed on an automated immunostainer (Ventana Medical Systems, Tucson AZ), with monoclonal antibodies CD30, CD20, CD3, and anti-IgD (Cell Marque, Rocklin CA) using standard technique. All cases were categorized based on morphology into 5 categories, corresponding to the patterns reported by Fan,
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